Sedimentation-Stabilized Water-Based Pigment Preparations

Abstract

The invention relates to aqueous pigment preparations, containing (A) 1 to 75 wt % of an organic or inorganic white or colored pigment or a mixture of various organic or inorganic white or colored pigments, (B) 0.01 to 40 wt % of one or more wetting and dispersing additives, (C) 0.01 to 5 wt % of a water-soluble or water-swellable, cross-linked copolymer containing 50 to 98.99 wt % of acrylamidoalkylsulfonic acid and salts thereof of the formula (I), 1 to 49.99 wt % of cyclic N-vinylcarboxamides of the formula (II), and 0.01 to 8 wt % of a cross-linking monomer having at least 2 olefinically unsaturated units, wherein R is a hydrogen atom or a methyl group, A is a linear or branched alkylene group having 1 to 8 carbon atoms, M is a hydrogen atom, ammonium, or an alkali metal ion, and n is an integer from 2 to 9.

What is claimed is: 
     
         1 . An aqueous pigment preparation comprising
 (A) 1 to 75 wt % of an organic or inorganic white or color pigment or of a mixture of various organic or inorganic white or color pigments,   (B) 0.01 to 40 wt % of one or more wetting and dispersing additives,   (C) 0.01 to 5 wt % of a water-soluble or water-swellable crosslinked copolymer comprising 50 to 98.99 wt % of acrylamidoalkylsulfonic acid and its salts of formula (I), 1 to 49.99 wt % of cyclic N-vinyl-carboxamides of formula (II) and 0.01 to 8 wt % of a crosslinking monomer having two or more olefinically unsaturated units,   
       
         
           
           
               
               
           
         
         where 
         R is a hydrogen atom or a methyl radical, 
         A is a linear or branched alkylene radical with 1 to 8 carbon atoms, 
         M is a hydrogen atom, ammonium or an alkali metal ion, 
         n is an integer from 2 to 9. 
       
     
     
         2 . The aqueous pigment preparation as claimed in  claim 1  comprising up to 2 wt % of at least one defoamer. 
     
     
         3 . The aqueous pigment preparation as claimed in  claim 1  and/or  2  comprising up to 2 wt % of at least one biocide. 
     
     
         4 . The aqueous pigment preparation as claimed in one or more of  claims 1 - 3  comprising up to 20 wt % of further auxiliaries which are customary for the production of pigment preparations and selected from solvents, humectants, pH regulators, preservatives, defoamers and rheology modifiers. 
     
     
         5 . The aqueous pigment preparation as claimed in one or more of  claims 1 - 4  wherein A is an alkylene radical having 2-5 carbon atoms. 
     
     
         6 . The aqueous pigment preparation as claimed in one or more of  claims 1 - 5  wherein n is 3, 4 or 5. 
     
     
         7 . The aqueous pigment preparation as claimed in one or more of  claims 1 - 6  comprising water ad 100 wt %. 
     
     
         8 . The use of a water-soluble or water-swellable crosslinked copolymer comprising 50 to 98.99 wt % of acrylamidoalkylsulfonic acid and its salts of formula (I), 1 to 49.99 wt % of cyclic N-vinylcarboxamides of formula (II) and 0.01 to 8 wt % of a crosslinking monomer having two or more olefinically unsaturated units, 
       
         
           
           
               
               
           
         
         where 
         R is a hydrogen atom or a methyl radical, 
         A is a linear or branched alkylene radical with 1 to 8 carbon atoms, 
         M is a hydrogen atom, ammonium or an alkali metal ion, 
         n is an integer from 2 to 9, 
         as a sedimentation stabilizer for aqueous pigment preparations comprising 
         (A) 1 to 75 wt % of an organic or inorganic white or color pigment or of a mixture of various organic or inorganic white or color pigments, 
         (B) 0.01 to 40 wt % of one or more wetting and dispersing additives.